creating 3D race tracks with elevation
There is an addon that allows you to do this, you can download it here:
Import GPX. You will also need to download the .gpx file from the website you linked in your question (select Download as > GPX Track).


Install the addon and activate it.


Go to File > Import > GPX (.gpx)


Select the .gpx file you downloaded, make sure that Use elevation for Z-coordinate option is checked, and clickImport GPX.


It may seem that nothing was added to the scene but you'll notice a new object in the Outliner (with the same name as your .gpx file). You can't see it in the scene because the track is very big (it's 2 km wide). Unless you want to keep it the original size, select the object, press N to open Properties panel, and change scale to something like 0.005. You should be able to see the whole track now. Apply the scale by pressing Ctrl + A > Scale.


Press 3 to view the track from the right side (ortho) and Tab to Edit Mode. Select all vertices (A) and extrude them (E) down on Z axis (Z).


Press S > Z > 0 to align vertices on Z axis.


Go back to Object Mode (Tab), press N to open Tool shelf and enable smooth shading on the object. 


Enable Auto smooth option in the Object Data panel, and set the Angle to 80°.


Add Solidify modifier and set preferred Thickness (3 cm look nice).


Add a ground plane, add a white diffuse material to both the track and the ground plane, add lights to the scene (only sun lamp in my scene) - and render.